Values in this field link to pages explaining in detail what is unsupported and why, what the concequences are and what you can do about it.
List multiple values comma separated.
Keep the values as short as possible, don't write books in here!

SHORT (!) comments like “rename image to 'firmware.bin' before flashing.”

Picture

Single general picture (outside/case) to identify the device; Put more detail pictures (inside/PCB) on device page

_img100s

1) Get picture from OEM website
(min 640×480; max 1280×720, max 1MB)2) Store it in the OpenWrt wiki via the media-manager: media:toh:brand:brand_model_general_view.jpg3) Get link to picture: Find picture in media manager, click on it, scroll down, copy the link4) Add link to the dataentry. Do not link to OEM website, because that link may change.

Misc

Comments

Anything that's worth mentioning

Nice colour!
Small formfactor (wallwart-sized)

textbox

The only restriction: Keep it SHORT! Put any detailed content which needs more space on the devicepage.